On Tuesday 29 July 2008, Tim Michelsen wrote: > Hello, > what methodes are recommended to use within GRASS to calibrate a map > with by using geostatistical methods? > OK, normally the method depends on the kind of data. Therefore I may > give an example: > > I have long-term meteorological mesurement data (timeseries aggregated > to monthly frequency) from the climate data logging stations in a > region. The components are temperature, humidity, wind speed and > direction as well as precipitation. These are imported by v.in.ascii and > interpolated into a map. This data may come from a third-party source > or be obtained by remote sensing. > > Since it is difficult to obtain reliable data I put my own three > stations out in the field at critical points where I have the most > doubts about the data. I conduct two years of measurements. > > How to I update my interpolated map with the new values obtained from > the three stations?
How about something like this: # import and interpolate first dataset v.in.ascii in=large_dataset.csv out=d1 ... v.surf.rst ... # looks good / bad d.rast ... > Of course, I can just update the corresponding z values of xyz-vector > (externally in OOo Calc or by scripting) and then interpolate again. > Or update all values of the input data according to a calculated > deviation from the longterm value. > > But... > * is there any tool or workflow that could facilitate this? > * is there any article or report that describes doing such a procedure > using > GRASS? # now compare to my points by patching then re-interpolating: v.in.ascii in=my_dataset out=d2 ... v.patch in=d1,d2 out=d3 v.surf.rst in=d3 ... If you want to compare interpolated values at your locations, without re-interpolating try v.what.rast. > > I am just asking for ideas and experineces. > Thanks in advance for any hints or pointers. > > I think that this is related to the recent question: > Thin plate spline for climate point record interpollation? > http://permalink.gmane.org/gmane.comp.gis.grass.user/24940 > > Kind regards, > Timmie Good luck, Dylan > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
